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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
917273	Rambus Inc	RMBS	Semiconductors & Related Devices (3674)	943112828

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1192508	Mark Horowitz	4440 El Camino Real Los Altos CA 94022		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2010-06-01	20,000	$23.29	974,976	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnote

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	16,678	Direct

Footnotes

The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 5, 2009.
The sale price reported in column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $22.92 to $23.73 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
987,737 shares of Rambus common stock were previously reported in form filings as a direct holding of the Reporting Person and should have been reported as an indirect holding by the Mark & Jody Buckley Living Trust dated June 21, 2003.
Shares held directly by the Mark Horowitz & Jody Buckley Living Trust dated June 21, 2003 for which the Reporting Person serves as a trustee.